Don't zergs make you think of diahhrea too? With all their squishy blobby forms and icky noises, it's all I can think of when playing a zerg. A big pile of diahhrea.
...and yet another troll post from mcstupid. yeah, it kinda has to do with them being all organic and stuff. lots of bodily fluids. and mucus.
diarree (dutch translation for you folks who dont understand) Now imagine what sounds growling zerglings should make